1131821618555 has 8 divisors (see below), whose sum is σ = 1358192326992. Its totient is φ = 905453038368.

The previous prime is 1131821618533. The next prime is 1131821618567. The reversal of 1131821618555 is 5558161281311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131821618555 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1084352 + ... + 1854578.

It is an arithmetic number, because the mean of its divisors is an integer number (169774040874).

Almost surely, 2^{1131821618555} is an apocalyptic number.

1131821618555 is a deficient number, since it is larger than the sum of its proper divisors (226370708437).

1131821618555 is an equidigital number, since it uses as much as digits as its factorization.

1131821618555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064125.

The product of its digits is 288000, while the sum is 47.

Adding to 1131821618555 its reverse (5558161281311), we get a palindrome (6689982899866).

The spelling of 1131821618555 in words is "one trillion, one hundred thirty-one billion, eight hundred twenty-one million, six hundred eighteen thousand, five hundred fifty-five".